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Network virtualisation in a cloud typically uses

  • A.no network of any kind at all
  • B.only wireless network connections
  • C.overlay networks over a shared fabric
  • D.a separate physical network per tenant

Answer: C

Correct answer: overlay networks over a shared fabric

Each tenant’s network is built as an overlay - VXLAN, GENEVE or similar - whose frames are encapsulated and carried across one shared physical fabric. That gives every tenant an apparently private network with its own addressing, without a cable per tenant and without the twelve-bit VLAN limit that would otherwise cap the number of segments at about four thousand.

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